(45) most of iceland is a rugged, barren
_, and most residents live in the
(46) much of antarctica is a high
surrounded by
and
(47)
-
is the largest island on earth, and most of it is covered by an

(48) most residents of greenland live along the
coast.
(49) greenland's economy is based on
processing of fish.
(50) arctic water in the abyss has a greater
than surface water because:
is less salty, and it dilutes the water when it
-, and
match
; and
(b)
water sinks because it is more
than
water.